EXHIBIT 12

Ratio of earnings from continuing operations to fixed charges and preferred stock dividends
	Twelve months			Twelve months			Twelve months			Twelve months			Twelve months
	ended			ended			ended			ended			ended
	Dec. 31			Dec. 31			Dec. 31			Dec. 31			Dec. 31
	2006			2005			2004			2003			2002
Income from continuing operations		370,027			334,479			337,244			344,707			193,533
Income taxes from continuing operations		221,122			203,291			210,128			187,252			105,505
Net income from continuing operations before income taxes		591,149			537,770			547,372			531,959			299,038
Adjustments to earnings (from continuing operations):
Fixed charges		198,479			205,270			212,427			227,853			223,689
Capitalized interest		(1,905	)		(2,826	)		(762	)		(488	)		(1,230	)
Preferred stock dividend requirement, before tax		(617	)		(643	)		(614	)		(614	)		(614	)
Earnings from continuing operations, as adjusted		787,106			739,571			758,423			758,710			520,883
Fixed charges from continuing operations:
Interest expense		195,957			201,801			211,051			226,751			221,845
Capitalized interest		1,905			2,826			762			488			1,230
Preferred stock dividend requirement, before tax		617			643			614			614			614
Total fixed charges		198,479			205,270			212,427			227,853			223,689
Ratio of earnings from continuing operations to fixed
charges and preferred stock dividends		3.97			3.60			3.57			3.33			2.33